Master of Veterinary Science, Lecturer of the Department of Veterinary Public Health Davletova A. A.

Kostanai State University named after A.Baytursynov

Microbial contamination of air houses for rearing stock.

The main purpose of the area of herd repair is to prepare a healthy rearing stock of high productiveness for partial or complete replacement of the adult industrial and parent stock. Depending on the configuration area specified in the process schedule, poultry operation is carried out in the following order: to fill the parent stock it will be up to 22 weeks, for industrial one it will durate for 17 weeks.

Throughout the period of our research there was a two-time turnover in poultry houses. Growing of birds at the first process cycle lasted for 19 weeks, in the second one it lasted for 17 weeks. The first entry of the day-old birds into the prepared poultry number 7 was carried out after the prophylactic break (21 days) in early November, and the second one was caried out in late April. One of the objectives of our research was to study in these areas the growth of number of microorganisms in the air seasonably and to clarify the influence of the level of microbial contamination of poultry houses on the body of birds.

The autumn research period coincided with the time of cultivation of the poultry from 1 to 60, winter period from 60 to 119, spring period from 1 to 90, the summer one from 90 to 154 of days' age. Maximum permitted level of microbial background in autumn and spring time is 60-150 thousand KOE/m3, in winter and summer time it is 180 thousand KOE/m3. Results of the study of bacterial contamination and preservation of birds in the areas for rearing of rearing stock are shown in Table 1.

Table 1 - Microbial contamination of air and preservation of birds in the area for rearing stock in different seasons

Object of investigation	Year seasons	Microbial contamination of air, thous. КОЕ/m^3	Save of birds, %
“Sever ptitsa” JSC	Autumn	148,5±1,5	99
	Winter	211,2±1,7	96
	Spring	181,0±1,6	94
	Summer	161,8±1,4	93

Seasonable analysis of the microbial contamination of the poultry houses No 7 air gives you the opportunity to assess the sanitary condition of the premises. Thus, the largest airborne microbial background was observed in the winter (in the house number 7 it was 211,2 ± 1,7 thousand KOE/m3), and the lowest one was in autumn (in the house number 7 it was 148,5 ± 1,5 thousand KOE/m3) periods. Indicators of microbial contamination in the spring season of the year were higher than the maximum permissible level, on the average 1,2 times. Winter evidence exceeded MPC, on the average, 1,4 and in summer in 1,1 times.

Carrying out of preventive maintenance interval reflected on the low number of qualitative composition of the microflora in the air of poultry houses No 7 in autumn. Till the winter season , the number of microflora increased in 1.4 times . Transition of birds in late February to the area for the maintenance of adult birds and organization of the preventive recreation facilities in March will not only keep the growth of microbial contamination in spring, but also reduce it in 1.2 times.

The safety of livestock in poultry houses for keeping of rearing stock from autumn-winter time 96-99 %, and in the spring-summer period 93-94 %.

To identify of the dynamics of recovery of bacteria in spring time and determination of the extent of its impact on the status of rearing stock was carried out to study the level of microbial contamination of the air and the preservation of birds in one week. Strength of the bacteria was determined before and after the filling the paultry houses by the birds. The room temperature during this period was on average 32-33° C. The obtained results are shown in Table 2 .

Table 2 - seeding by the microorganisms of air environment of the paultry house and safety indicators of chickens

Criteria		Object of investigation
		Sever ptitsa” JSC
Seeding by the microorganisms of air environment, thous. КОЕ/m^3	Before setting of birds	9,7±0,7
	After 7 days after setting of birds	48,5±1,8
Quantity of chickens, units.	Healthy day-old units at the day of setting	13801
	Fallen at 7-day age	303

The results have shown that the number of bacteria in air for 7 days in areas of chicks have increased on average in 5 times . Studies of health of birds in this period showed that the number of culled chickens by the end of the week reached an average of 2.2% of the total population.

Thus, the increase of the degree of air pollution by microorganisms led to the culling of rearing birds.

List of references:

1 A.B. Baydevlyatov, T.I. Fotina Disinfection of poultry houses with associated Bacterioses / / Materials of international conference on scientific and applied problems of parazitecenology . - Kiev - Kharkov - Lugansk , 1992 .

2 V.V. Selivyorstov, I.A. Dudnitsky , N.I. Popov - Disinfection system of animal health measures / / Veterinary Medicine . - 1999 . - № 2 .

3 S.H. Umyarov Influence of aerosol air pollution of poultry houses by yodohlorin on clinical and morphological productive and reproductive performance of chickens cross " Change" : Candidate of Biological Sciences: 16.00.03 . - Kazan: Institute named after Bauman , 1998 .